Malicious PDF — malware analysis report

Static analysis result for SHA-256 396743a1dfba5a6d…

MALICIOUS

PDF

65.1 KB Created: 2021-09-21 15:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f85b65f617938746b8268f2e666d066c SHA-1: 7dcaab687a03239a2f7fde0c37b99b8f6dd8f9c0 SHA-256: 396743a1dfba5a6dc8fe619e9eab80bf1c108b21aa621a85c589af170c48341e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/biwusiluwosixu.pdf In PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/biwonukuzurunenifaze.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109121146260703779vh3suazut68.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/26636221170.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/454afa91cb708ad9d43857ba0413540c/sogevezigewigel.pdfIn PDF document text
    • http://secoinblock.com/upload/files/90777699209.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ae2b52183f4863081e4c36dbf68459fb/8969723093.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/43817083671.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/vitadakadad.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109090301187198.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/96919750042.pdfIn PDF document text
    • http://usmleworkout.com/files/file/37091260127.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/96449047285.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161426ff403b01---baxikut.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/85387870956.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/67227589602.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/974a8ce4fc0e94702ea006f5107a22ca/11857048799.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/37605301468.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/zuputunagukazexamilu.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/zixavum.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/jamiweku.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/murabumujegupep.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/wujojetuxujasoxobizo.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/83304009568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+hack+someones+discordPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 10756 bytes
SHA-256: cc422e17f31bb8c5038ade5502b3e630dfb0b6b71739d135c8acd56d4fcc1e55

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